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Comparative analysis of current 3D printed acetabular titanium implants.

Lorenzo Dall'Ava1, Harry Hothi2, Johann Henckel2

  • 1Institute of Orthopaedics and Musculoskeletal Science, University College London, Brockley Hill, Stanmore, HA7 4LP, UK. lorenzo.dallava.17@ucl.ac.uk.

3D Printing in Medicine
|November 8, 2019
PubMed
Summary
This summary is machine-generated.

This study compared three-dimensional (3D) printed acetabular cups, revealing significant design variations in porous structures and surface beads. These differences, particularly titanium bead prevalence, may impact patient outcomes in hip replacements.

Keywords:
3D printingAcetabular cupAdditive manufacturingHip ArthroplastyOrthopaedic implant

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Area of Science:

  • Biomaterials Engineering
  • Orthopedic Implants
  • Additive Manufacturing

Background:

  • Three-dimensional (3D) printing allows complex porous structures in acetabular cups, but design variations across manufacturers are understudied.
  • Existing research primarily focuses on clinical outcomes, neglecting detailed design analysis of 3D printed hip implants.

Purpose of the Study:

  • To analyze and compare the structural designs of three different 3D printed acetabular cups from distinct manufacturers.
  • To investigate morphometric features, surface characteristics, and potential manufacturing by-products of these implants.

Main Methods:

  • Scanning electron microscopy (SEM) for outer surface analysis.
  • Micro-computed tomography (micro-CT) for lattice structure morphometry.
  • Coordinate measuring machine (CMM) and optical profilometry for internal surface analysis.

Main Results:

  • Significant variability in pore size, porosity, and lattice/solid wall thickness among the analyzed cups (Delta TT, Trident II Tritanium, Mpact 3D Metal).
  • Trident II Tritanium exhibited smaller titanium beads and lower porosity compared to Delta TT and Mpact 3D Metal.
  • Internal cup surfaces showed similar roundness and roughness across all tested designs.

Conclusions:

  • This is the first comparative study on the designs of multiple 3D printed acetabular cups, highlighting significant morphological differences.
  • The presence and size of titanium beads, a manufacturing by-product, vary across designs and warrant consideration due to potential in-vivo release.
  • Understanding these design variations is crucial for predicting clinical performance and patient outcomes in 3D printed hip implants.